text: #include "edge-impulse-sdk/dsp/config.hpp"
  #if EIDSP_LOAD_CMSIS_DSP_SOURCES
  /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_cmplx_mag_squared_f32.c
   * Description:  Floating-point complex magnitude squared
   *
   * $Date:        18. March 2019
   * $Revision:    V1.6.0
   *
   * Target Processor: Cortex-M cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * Licensed under the Apache License, Version 2.0 (the License); you may
   * not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include "edge-impulse-sdk/CMSIS/DSP/Include/arm_math.h"
  
  /**
    @ingroup groupCmplxMath
   */
  
  /**
    @defgroup cmplx_mag_squared Complex Magnitude Squared
  
    Computes the magnitude squared of the elements of a complex data vector.
  
    The <code>pSrc</code> points to the source data and
    <code>pDst</code> points to the where the result should be written.
    <code>numSamples</code> specifies the number of complex samples
    in the input array and the data is stored in an interleaved fashion
    (real, imag, real, imag, ...).
    The input array has a total of <code>2*numSamples</code> values;
    the output array has a total of <code>numSamples</code> values.
  
    The underlying algorithm is used:
  
    <pre>
    for (n = 0; n < numSamples; n++) {
        pDst[n] = pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2;
    }
    </pre>
  
    There are separate functions for floating-point, Q15, and Q31 data types.
   */
  
  /**
    @addtogroup cmplx_mag_squared
    @{
   */
  
  /**
    @brief         Floating-point complex magnitude squared.
    @param[in]     pSrc        points to input vector
    @param[out]    pDst        points to output vector
    @param[in]     numSamples  number of samples in each vector
    @return        none
   */
  
  #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
  
  void arm_cmplx_mag_squared_f32(
    const float32_t * pSrc,
          float32_t * pDst,
          uint32_t numSamples)
  {
      int32_t blockSize = numSamples;  /* loop counters */
      uint32_t  blkCnt;           /* loop counters */
      f32x4x2_t vecSrc;
      f32x4_t sum;
      float32_t real, imag;                          /* Temporary input variables */
  
      /* Compute 4 complex samples at a time */
      blkCnt = blockSize >> 2;
      while (blkCnt > 0U)
      {
          vecSrc = vld2q(pSrc);
          sum = vmulq(vecSrc.val[0], vecSrc.val[0]);
          sum = vfmaq(sum, vecSrc.val[1], vecSrc.val[1]);
          vst1q(pDst, sum);
  
          pSrc += 8;
          pDst += 4;
          
          /*
           * Decrement the blockSize loop counter
           */
          blkCnt--;
      }
  
      /* Tail */
      blkCnt = blockSize & 3;
      while (blkCnt > 0U)
      {
        /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
    
        real = *pSrc++;
        imag = *pSrc++;
    
        /* store result in destination buffer. */
        *pDst++ = (real * real) + (imag * imag);
    
        /* Decrement loop counter */
        blkCnt--;
      }
  
  }
  
  #else
  void arm_cmplx_mag_squared_f32(
    const float32_t * pSrc,
          float32_t * pDst,
          uint32_t numSamples)
  {
          uint32_t blkCnt;                               /* Loop counter */
          float32_t real, imag;                          /* Temporary input variables */
  
  #if defined(ARM_MATH_NEON) && !defined(ARM_MATH_AUTOVECTORIZE)
    float32x4x2_t vecA;
    float32x4_t vRealA;
    float32x4_t vImagA;
    float32x4_t vMagSqA;
  
    float32x4x2_t vecB;
    float32x4_t vRealB;
    float32x4_t vImagB;
    float32x4_t vMagSqB;
  
    /* Loop unrolling: Compute 8 outputs at a time */
    blkCnt = numSamples >> 3;
  
    while (blkCnt > 0U)
    {
      /* out = sqrt((real * real) + (imag * imag)) */
  
      vecA = vld2q_f32(pSrc);
      pSrc += 8;
  
      vRealA = vmulq_f32(vecA.val[0], vecA.val[0]);
      vImagA = vmulq_f32(vecA.val[1], vecA.val[1]);
      vMagSqA = vaddq_f32(vRealA, vImagA);
  
      vecB = vld2q_f32(pSrc);
      pSrc += 8;
  
      vRealB = vmulq_f32(vecB.val[0], vecB.val[0]);
      vImagB = vmulq_f32(vecB.val[1], vecB.val[1]);
      vMagSqB = vaddq_f32(vRealB, vImagB);
  
      /* Store the result in the destination buffer. */
      vst1q_f32(pDst, vMagSqA);
      pDst += 4;
  
      vst1q_f32(pDst, vMagSqB);
      pDst += 4;
  
      /* Decrement the loop counter */
      blkCnt--;
    }
  
    blkCnt = numSamples & 7;
  
  #else
  #if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
  
    /* Loop unrolling: Compute 4 outputs at a time */
    blkCnt = numSamples >> 2U;
  
    while (blkCnt > 0U)
    {
      /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
  
      real = *pSrc++;
      imag = *pSrc++;
      *pDst++ = (real * real) + (imag * imag);
  
      real = *pSrc++;
      imag = *pSrc++;
      *pDst++ = (real * real) + (imag * imag);
  
      real = *pSrc++;
      imag = *pSrc++;
      *pDst++ = (real * real) + (imag * imag);
  
      real = *pSrc++;
      imag = *pSrc++;
      *pDst++ = (real * real) + (imag * imag);
  
      /* Decrement loop counter */
      blkCnt--;
    }
  
    /* Loop unrolling: Compute remaining outputs */
    blkCnt = numSamples % 0x4U;
  
  #else
  
    /* Initialize blkCnt with number of samples */
    blkCnt = numSamples;
  
  #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
  #endif /* #if defined(ARM_MATH_NEON) */
  
    while (blkCnt > 0U)
    {
      /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
  
      real = *pSrc++;
      imag = *pSrc++;
  
      /* store result in destination buffer. */
      *pDst++ = (real * real) + (imag * imag);
  
      /* Decrement loop counter */
      blkCnt--;
    }
  
  }
  #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
  
  /**
    @} end of cmplx_mag_squared group
   */
  
  #endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
  